JavaFX button background image - image

Question

I have problem with setting backgroundImage on button in JavaFX.
Image newGame = new Image("File:/CSS/nova_hra.png");
BackgroundImage newGameBgr = new BackgroundImage(newGame, null, null, null, null);
Button buttonNewGame = new Button("Nová Hra");
Button buttonLoadGame = new Button("Načíst Hru");
Button buttonStatistics = new Button("Statistiky");
Button buttonExit = new Button("Konec");
buttonNewGame.setGraphic(new ImageView(newGame));
//buttonNewGame.setBackground(new Background(newGameBgr));
buttonExit.setMinHeight(40);
buttonLoadGame.setMinHeight(40);
buttonNewGame.setMinHeight(40);
buttonStatistics.setMinHeight(40);
buttonExit.setMinWidth(120);
buttonLoadGame.setMinWidth(120);
buttonNewGame.setMinWidth(120);
buttonStatistics.setMinWidth(120);
This does nothing with the buttonNewGame. Every time I tryed to load image with this
Image image = new Image(getClass().getResourceAsStream("a.png"));
I got runTime exception. When I used
Image image = new Image(getClass().getResourceAsStream("a.png"));
the whole image disapeard.

Answer 1

You can do it via css. If your background.jpg is in a package testing, simply do this:
package testing;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.Pane;
import javafx.stage.Stage;
public class Main extends Application {
#Override
public void start(Stage primaryStage) {
try {
Pane root = new Pane();
Button button = new Button( "Click me!");
button.setStyle("-fx-background-image: url('/testing/background.jpg')");
root.getChildren().add(button);
Scene scene = new Scene(root, 800, 400);
primaryStage.setScene(scene);
primaryStage.show();
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
launch(args);
}
}
If you don't want to use css, you could do it like this:
BackgroundImage backgroundImage = new BackgroundImage( new Image( getClass().getResource("/testing/background.jpg").toExternalForm()), BackgroundRepeat.NO_REPEAT, BackgroundRepeat.NO_REPEAT, BackgroundPosition.DEFAULT, BackgroundSize.DEFAULT);
Background background = new Background(backgroundImage);
Button button = new Button( "Click me!");
button.setBackground(background);